The interchange will be east of Belgrade, near the Bozeman Yellowstone International Airport.

Drivers will be able to exit I-90 roughly between mile posts 298 and 301, and travel south to Alaska Frontage Road and north to the Frontage Road.

NBC Montana was there as community leaders dug their shovels in the dirt, and celebrated the official start of the $37.2 million project.

Gallatin County Commissioner Joe Skinner told us the interchange will improve traffic congestion, provide easier airport access and improve safety. He said the interchange will be the only under-railroad access in the area.

Five government jurisdictions worked together, he said, to make this project finally happen after years of discussion.

"I think it's almost unprecedented that that many government jurisdictions in Montana come together with a project like this, with funding and design," Skinner said, adding "it's just very exciting for me to see that happen."

The first phase of construction happening now will involve building a temporary rail line, construction of the new railroad bridge and the new on-off ramps.

The project is expected to be finished within two years.

Copyright 2013 by KECI, KCFW, KTVM. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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